Looks like the repo owner force-pushed a bad commit to replace an existing one. But then, why not forge it to maintain the existing timestamp + author, e.g. via `git commit --amend -C df8c18`?

Innocuous PR (but do note the line about "pedronauck pushed a commit that referenced this pull request last week"): https://github.com/pedronauck/reworm/pull/28

Original commit: https://github.com/pedronauck/reworm/commit/df8c18

Amended commit: https://github.com/pedronauck/reworm/commit/d50cd8

Either way, pretty clear sign that the owner's creds (and possibly an entire machine) are compromised.